Section-elbow for concrete-conveyers.



1. c. K..suAnT SECTION ELBOW FOR CONCRETE CONVEYERS. APPLICAIDN FILEDJUL-.Y'Sll 1916.

Puma. 1mg, 1917.

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@513, ra I JOHN C. K. STUART, 0F MONTREAL, QUEBEC, CANADA.

SECTION-ELBOW FOR CONCBETE-CONVEYERS..

Specification of Letters Patent.

iiatented Jan. 9, 191?.

Application filed July 31, 1916. Serial No. 112,384.

To au whom it may concern Be it known that I, JOHN` C. K. STUART, asubject of the King of Great Britain, residing at Montreal, Province ofQuebec, anada, have invented certain new and useful Improvements in voncrete-Conveyers; and l do hereby declare that the following is a full,clear, and exact description of the invention, such as will enableothers skilled Iin the art to which it appertains to make and use thesame.

in mixing and placing concrete by the pneumatic concrete placingmethods, the concrete is conveyed in iron, steel or similar piping fiomthe mixer to the forms and in so conveying the concrete it is generallya necessity to arrange various sections of the piping at diierent anglesand the angular sections are connected by means of elbows. The concreteis conveyed through the pipes by compressed air at a very high pressurewhich causes the concrete to rate of speed. When the concrete comes inContact with the elbows of the piping systems it will strike one of theinner walls of the elbows due to the curvature of the elbows, and if theconcrete is very abrasive this portion of the elbow upon which theconcrete travels is caused to be worn outwithout affecting the otherportions of the elbows, thereby decreasing the life of the elbowcompared with the life of the remaining pipes in the system. v

The present invention relates to elbows to be used in connection withsuch conveying systems and an object of the invention is to provide anelbow of this characterv which can be easily and readily relined so asto insure its life and cause the same to of the novel features ofconstruction, and i last indefinitely.

With the above and other objects in view which will hereinafter appearas the description continues, the invention consists the formationof-parts as will be hereinafter more fully described vand particularlypointed out in the appended claim.

In the accompanying drawings is shown the simple and preferred form ofthe invention it being, however, understood that no limitation isnecessarily made to the precise structural details herein exhibited butthe right is hereby reserved to any changes or `alterations that may be,had and come with- 1n the scope of the invention without depart-Section-Elbows for travel at a fastl ing` from the spirit thereof orsacrificing the efficiency 0f the same.

In the accompanying drawings; Figure l is a side elevation of the elbowembodying the present invention; Fig. 2 is a vertical section takenthrough one of the sections of the elbow and having a portion of itslining removed; and, Fig. 3 is a vertical transverse section takenthrough the elbow.

Elbows heretofore used ir connection with such concrete conveyingsystems have been cast of one piece of suitable metal, but that portionof the elbow upon which the concrete travels is soon worn out and theentire elbow is required to be discarded.

Referring to the accompanying drawings wherein like and correspondingparts are designated by similar reference characters throughout theseveral views, I have illustrated the elbow embodying the subjectmatterof the present invention which comprises two semi-cylindrical sections Aand. B respectively each of which having formed integral' therewith andextending radially from the sides thereof the apertured lugs 1- throughwhich suitable bolts may extend for coupling the sections together. Theopposite ends of each section are provided with the .flanges 2 havingthe openings 3 therein whereby the ends of the elbow may be connected inthe usual manner to the adjacent sections of the piping of the conveyingsystem.

The body portion of the inner section B is of a concave-convexconguration having the longitudinally extending iianges 4 formed alongthe opposite sides thereof, whereas the opposite sides of the outersectionfA are provided with longitudinal` recesses for the reception ofthese flanges thereby forming an air-tight joint-,between the sectionsof the elbow when they are connected together.

The inner wall of the outer section A is concave so that when thesections are connected together they will form a cylindrical borethroughout the entire length of the elbow and the outer periphery of thesection A is eccentric with relation to the inner periphery of thesection A thereby slightlyenlarging the medial portion of this section.

Extending through the entire length of the medial portion of the SectionA is a groove 5 in which is adapted to be arranged these blocks l are ofthe same curvature as the inner perlphery of the section A so that whenthey are placed in position theywill form a continuation of the innerperiphery of this section whereas the' opposite -faces of these blocksare of the same curvature as the outer periphery of this section so thatthe medial portion of this section can be made to have the samethickness as the body portion B and its strength will not be impaired,due to the groove 5 formed therein. This inner lining mayv be of asingle piece of metal or of any number of sections and these linings maybe connected to the section A by means ofbolts as shown, by a dovetailedconnection or any other 4suitable connection. In the connection as shownthe section A is provided with a plurality of apertures 7 and ,adaptedto register -with these apertures are the openings formed withintheblocks 6, whereby the bolts 8 may extend therethrough. The heads of thebolts are countersunk within the blocks so as not to protrude in thepath of the concrete while the same is passing through the elbows.

From the foregoing it is obvious that when the concrete passes throughthe elbow itlwill travel against the inner `sections adapted to form acylindrical bore `therein when connected' together, an airtightconnection between said sections,-l the medial portion of one of saidsections being enlarged, said enlarged section being provided with agroove extending throughout the entire length of said section, aplurality of blocks adapted to be arranged within said groove, the innerperiphery of said blocks being of the same curvature as the innerperiphery of said section and adapted `to form a continuation thereof,and a detachable connection between each block and said for the purposesetforth.

In witness whereof I have hereunto set my hand.

4 A JOHN C. K. STUART.

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